claaarky - 9:54 am on Jun 29, 2012 (gmt 0)
There's an opinion that social marketing affects your rankings. It doesn't, not really.
Social media gets visitors to your site, at which point Google can collect user metrics, decide on site quality and get you ranking (if your site offers a good user experience). Once you're ranking, you don't need social media any more. The traffic is coming from Google.